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绑定变量做的事情很朴素：把变化的值从 SQL 文本里抽出来，用占位符 :1 、:2 代替，SQL 文本固定不变，Oracle 第一次硬解析后把执行计划缓存进共享池，后续同样的文本直接软解析复用。类比一下，硬解析像每次点菜都让厨师重新研究菜谱，绑定变量像菜谱固定、只换食材，厨师看一眼就能开做。